Texas Instruments TPS7A21EVM-059, Руководство пользователя, Страница: 5 / 18

3.3 TPS7A21 LDO Operation
The TPS7A21EVM-059 evaluation module contains the TPS7A21 LDO with input and output capacitors
installed. These three components provide the minimum required solution size, as illustrated by the white boxes
in
Figure 1-1 . Additional pads are available to test the LDO with additional input and output capacitors beyond
what is already installed on the EVM. The TPS7A21 LDO can be enabled or disabled by using the J5 3-pin
header.
1. Place a 2-pin shunt across the header to tie VIN to EN to enable the device.
2. Place a 2-pin shunt across the header to tie GND to EN, or leave the 3-pin header floating to disable the
device.
Alternatively, by connecting an external function generator to TP1 (EN) and a nearby GND post (J6), the
user can enable or disable the TPS7A21 LDO after VIN is applied.
Figure 3-1 shows the result of the
TPS7A21EVM-059 during turn on. The blue trace is the enable voltage, and the red trace is the output voltage.
Figure 3-1. TPS7A21EVM-059 Turn On
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SBVU072 – OCTOBER 2021
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TPS7A21EVM-059 Evaluation Module 5
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